This paper presents, explores and compares object-oriented approaches for roles in statically typed programming languages. We choose five solutions which support information hiding. On the one hand, we investigate the established object-oriented possibilities multiple and interface inheritance and the role object pattern, on the other hand, we examine the language extensions Object Teams and th...

Injury prevention experts have suggested that gun manufacturers could reduce youth violence by changing the design of guns. Product safety features could make guns more difficult for children to fire unintentionally and more difficult to use if stolen or obtained illegally. This article gives a brief history of efforts to make safer, smarter guns and assesses the potential of the product safety...

Collaborative systems are becoming increasingly important, because they enable several users to work together and carry out collaboration, communication and coordination tasks. We have to highlight that, to perform these tasks, the users have to be aware of other users’ actions, usually by means of a set of awareness techniques. Usually, the specification of this set of techniques has to be don...

Interactive multimedia technology has seen a great deal of recent attention since it will allow its users with the flexibility of selecting and receiving specific information; many telecommunication industries and research groups are thus employing a lot of their resources to study the feasibility of new video services, nowadays known as Video on Demand (VoD). Among these services, T-VoD (True-...

In service-oriented systems services can be easily reused and shared without modification. However, there are business situations where a variation of services is needed to meet the requirements of a specific customer or context. Variation of software systems has been well researched in product line engineering in terms of Variability Implementation Techniques (VITs). While most VITs focus on t...

Object-oriented (00) technology has been heralded as a solution to the problems of software engineering. The claims are that 00 technology promotes understandability, extensibility, evolvability, reusability, and maintainability of systems and that 00 systems are easy to understand and use. However, this technology has not been as successful as expected. An analysis of experiences and empirical...